More than 500 million of us use Google Calendar to feel organised in this ever-so chaotic world . It's a convenient tool, one that allows users to quickly schedule their work and personal meetings, manage their time better, and make sure they never forget those important dates. However, the app's sheer popularity also means it's a prime target for fraudsters and hackers, who have sent out thousands of phishing emails in recent months to obtain personal information - including your bank details.